Golf club heads and methods to manufacture golf club heads

A method of manufacturing a golf club head, the method comprising:

• forming a body portion having a toe portion, a heel portion, a top portion, a sole portion, an interior cavity portion, a back portion, and a plurality of exterior ports, the plurality of exterior ports comprising a first set of exterior ports formed in the back portion above a horizontal midplane and closer to the toe portion than the heel portion, and a second set of exterior ports formed in the back portion below the horizontal midplane and extending from the toe portion to the heel portion;
• forming a face portion having a thickness of less than or equal to 1.524 millimeters (0.060 inch);
• coupling the face portion to the body portion to close the interior cavity portion;
• injecting a shock-absorbing elastic polymer material into the interior cavity portion through one of the plurality of exterior ports;
• providing a first set of mass portions and coupling each of the first set of mass portions to a corresponding exterior port of the first set of exterior ports;
• and
• providing a second set of mass portions and coupling each of the second set of mass portions to a corresponding exterior port of the second set of exterior ports.

A method of manufacturing a golf club, the method comprising:

• forming a body portion having a toe portion, a heel portion, a top portion, a sole portion, an interior cavity portion, a back portion, a first plurality of threaded openings located in the back portion above a horizontal midplane, and a second plurality of threaded openings located in the back portion below the horizontal midplane;
• forming a face portion comprising a strike face having a plurality of grooves and a reinforcement section between each pair of adjacent grooves;
• joining the face portion to the body portion to close the interior cavity portion;
• injecting a polymer material into the interior cavity portion through one of the first plurality of threaded openings or one of the second plurality of threaded openings, wherein the polymer material substantially fills the interior cavity portion and extends from the back portion to the face portion, wherein the polymer material is configured to dampen vibrations resulting from the face portion striking a golf ball;
• providing a first plurality of threaded plugs and closing each of the first plurality of threaded openings with one of the first plurality of threaded plugs;
• providing a second plurality of threaded plugs and closing each of the second plurality of threaded openings with one of the second plurality of threaded plugs;
• and
• attaching a shaft to the body portion.